Centrifugal pump



July 2, c E KOONS CENTRIFUGAL PUMP Filed Oct. '7, 1952 IIIIIIFWI IIIPatented July 2, 1935 UNITED STATES PATENT OFFICE CENTRIFUGAL PUMPApplication October 7, 1932, Serial No. 636,744

1 Claim.

The invention chiefly is concerned with the problem of pumping water andother fluids containing solid matter in suspension and provides certainimprovements in the rotors or impellers of centrifugal pumps to the endof accelerating flow by eliminating or minimizing conditions, thepresence of which makes for obstruction, choking action and otherfriction forces tending to retard flow and tending to rapid anddestructive wear.

Otherwise stated, the invention is embodied in an impeller havingcertain novel and useful characteristics whereby the output of the pumpis considerably increased and whereby the wear on the vanes, backshroud, and pump casing is considerably reduced.

One embodiment of the invention is illustrated in the accompanyingdrawing forming a part hereof, wherein Figure 1 is a central verticalsection of the improved pump.

Fig. 2 is. a section on line 2-2 of Fig. 1.

Fig. 3 is a section through the casing to show the rotor in plan; and

Fig. 4 is a section on line 4.& of Fig. 1.

For the sake of clearness the end plates on the suction and enginesides, 6 and '1, respectively, of the pump casing 5 have been omitted,but it will be understood that such plates are a complement a of thecasing in accordance with the usual practice.

The rotor or impeller 8 has a hub- 9 whereby it is mounted for rotationon a shaft l9.

l-Ieretofore, it has been the practice to equip impellers with vaneshaving fiat driving or propelling faces, the effect of which was that,under operating conditions, the material tended to crowd the engine sideof the casing thereby preventing a free discharge and causing the pumpto clog or choke.

I depart from this practice and provide an impeller so constructed as toforce the material to the center of the pump, rather than have it crowdthe engine side, thereby providing for free discharge and reducing wearon the parts.

According to my invention the rotor is a unit casting embodying a pairof spaced disks of which one, as before indicated, is equipped forrotative mounting, and of which the other, I I, is of general ring form,there being a central opening l2 directed towards the suction side ofthe pump casing. The rotor disks have impeller characteristics conferredupon them by a series of intermediate tying webs in the form of curvedradially disposed vanes or flukes l3 springing from the main orhub-carrying casting and themselves carrying the other disk or suctionring. The vanes or impeller elements I3 are, in contradistinction withthe old practice, of concave form well defined throughout their entirelengths. Otherwise stated, they are of general scoop form as indicatedat M developed by a concavo-convexo construction of web.

Having described the invention, what I claim A pump impeller includingspaced disks, one being solid and the other formed with a suctionopening, a hub mounting formed as an integral part of the solid disk,and webs arranged wholly inwardly of the hub mounting and bridging thesuction opening, the webs being in a plane at right angles to the axisof the hub mounting and being concaved transversely and curvedlongitudinally, the opposing edges of the webs being integral with therespective disks and forming the sole support of the disk having thesuction opening.

CHARLES E. KOONS.

